I noticed that Deep Zoom Composer writes DZIs with a namespace of
http://schemas.microsoft.com/deepzoom/2009
However the official documentation and the only available schema refer to
http://schemas.microsoft.com/deepzoom/2008
XML dictates I cannot treat them as equivalent, although they seem to be. So does anyone know if there is a difference and even better, can point to some documentation?
Talking with the program manager for Seadragon at that time, he believes the only thing that was added was an optional extra tag to support Microsoft's Smooth Streaming server feature. If you're not using Smooth Streaming, the 2008 schema is identical to the 2009 one.